xref: /openbmc/linux/drivers/char/agp/alpha-agp.c (revision ca55b2fe)
1 #include <linux/module.h>
2 #include <linux/pci.h>
3 #include <linux/init.h>
4 #include <linux/agp_backend.h>
5 #include <linux/mm.h>
6 #include <linux/slab.h>
7 
8 #include <asm/machvec.h>
9 #include <asm/agp_backend.h>
10 #include "../../../arch/alpha/kernel/pci_impl.h"
11 
12 #include "agp.h"
13 
14 static int alpha_core_agp_vm_fault(struct vm_area_struct *vma,
15 					struct vm_fault *vmf)
16 {
17 	alpha_agp_info *agp = agp_bridge->dev_private_data;
18 	dma_addr_t dma_addr;
19 	unsigned long pa;
20 	struct page *page;
21 
22 	dma_addr = (unsigned long)vmf->virtual_address - vma->vm_start
23 						+ agp->aperture.bus_base;
24 	pa = agp->ops->translate(agp, dma_addr);
25 
26 	if (pa == (unsigned long)-EINVAL)
27 		return VM_FAULT_SIGBUS;	/* no translation */
28 
29 	/*
30 	 * Get the page, inc the use count, and return it
31 	 */
32 	page = virt_to_page(__va(pa));
33 	get_page(page);
34 	vmf->page = page;
35 	return 0;
36 }
37 
38 static struct aper_size_info_fixed alpha_core_agp_sizes[] =
39 {
40 	{ 0, 0, 0 }, /* filled in by alpha_core_agp_setup */
41 };
42 
43 static const struct vm_operations_struct alpha_core_agp_vm_ops = {
44 	.fault = alpha_core_agp_vm_fault,
45 };
46 
47 
48 static int alpha_core_agp_fetch_size(void)
49 {
50 	return alpha_core_agp_sizes[0].size;
51 }
52 
53 static int alpha_core_agp_configure(void)
54 {
55 	alpha_agp_info *agp = agp_bridge->dev_private_data;
56 	agp_bridge->gart_bus_addr = agp->aperture.bus_base;
57 	return 0;
58 }
59 
60 static void alpha_core_agp_cleanup(void)
61 {
62 	alpha_agp_info *agp = agp_bridge->dev_private_data;
63 
64 	agp->ops->cleanup(agp);
65 }
66 
67 static void alpha_core_agp_tlbflush(struct agp_memory *mem)
68 {
69 	alpha_agp_info *agp = agp_bridge->dev_private_data;
70 	alpha_mv.mv_pci_tbi(agp->hose, 0, -1);
71 }
72 
73 static void alpha_core_agp_enable(struct agp_bridge_data *bridge, u32 mode)
74 {
75 	alpha_agp_info *agp = bridge->dev_private_data;
76 
77 	agp->mode.lw = agp_collect_device_status(bridge, mode,
78 					agp->capability.lw);
79 
80 	agp->mode.bits.enable = 1;
81 	agp->ops->configure(agp);
82 
83 	agp_device_command(agp->mode.lw, false);
84 }
85 
86 static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start,
87 					int type)
88 {
89 	alpha_agp_info *agp = agp_bridge->dev_private_data;
90 	int num_entries, status;
91 	void *temp;
92 
93 	if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES)
94 		return -EINVAL;
95 
96 	temp = agp_bridge->current_size;
97 	num_entries = A_SIZE_FIX(temp)->num_entries;
98 	if ((pg_start + mem->page_count) > num_entries)
99 		return -EINVAL;
100 
101 	status = agp->ops->bind(agp, pg_start, mem);
102 	mb();
103 	alpha_core_agp_tlbflush(mem);
104 
105 	return status;
106 }
107 
108 static int alpha_core_agp_remove_memory(struct agp_memory *mem, off_t pg_start,
109 					int type)
110 {
111 	alpha_agp_info *agp = agp_bridge->dev_private_data;
112 	int status;
113 
114 	status = agp->ops->unbind(agp, pg_start, mem);
115 	alpha_core_agp_tlbflush(mem);
116 	return status;
117 }
118 
119 static int alpha_core_agp_create_free_gatt_table(struct agp_bridge_data *a)
120 {
121 	return 0;
122 }
123 
124 struct agp_bridge_driver alpha_core_agp_driver = {
125 	.owner			= THIS_MODULE,
126 	.aperture_sizes		= alpha_core_agp_sizes,
127 	.num_aperture_sizes	= 1,
128 	.size_type		= FIXED_APER_SIZE,
129 	.cant_use_aperture	= true,
130 	.masks			= NULL,
131 
132 	.fetch_size		= alpha_core_agp_fetch_size,
133 	.configure		= alpha_core_agp_configure,
134 	.agp_enable		= alpha_core_agp_enable,
135 	.cleanup		= alpha_core_agp_cleanup,
136 	.tlb_flush		= alpha_core_agp_tlbflush,
137 	.mask_memory		= agp_generic_mask_memory,
138 	.cache_flush		= global_cache_flush,
139 	.create_gatt_table	= alpha_core_agp_create_free_gatt_table,
140 	.free_gatt_table	= alpha_core_agp_create_free_gatt_table,
141 	.insert_memory		= alpha_core_agp_insert_memory,
142 	.remove_memory		= alpha_core_agp_remove_memory,
143 	.alloc_by_type		= agp_generic_alloc_by_type,
144 	.free_by_type		= agp_generic_free_by_type,
145 	.agp_alloc_page		= agp_generic_alloc_page,
146 	.agp_alloc_pages	= agp_generic_alloc_pages,
147 	.agp_destroy_page	= agp_generic_destroy_page,
148 	.agp_destroy_pages	= agp_generic_destroy_pages,
149 	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
150 };
151 
152 struct agp_bridge_data *alpha_bridge;
153 
154 int __init
155 alpha_core_agp_setup(void)
156 {
157 	alpha_agp_info *agp = alpha_mv.agp_info();
158 	struct pci_dev *pdev;	/* faked */
159 	struct aper_size_info_fixed *aper_size;
160 
161 	if (!agp)
162 		return -ENODEV;
163 	if (agp->ops->setup(agp))
164 		return -ENODEV;
165 
166 	/*
167 	 * Build the aperture size descriptor
168 	 */
169 	aper_size = alpha_core_agp_sizes;
170 	aper_size->size = agp->aperture.size / (1024 * 1024);
171 	aper_size->num_entries = agp->aperture.size / PAGE_SIZE;
172 	aper_size->page_order = __ffs(aper_size->num_entries / 1024);
173 
174 	/*
175 	 * Build a fake pci_dev struct
176 	 */
177 	pdev = pci_alloc_dev(NULL);
178 	if (!pdev)
179 		return -ENOMEM;
180 	pdev->vendor = 0xffff;
181 	pdev->device = 0xffff;
182 	pdev->sysdata = agp->hose;
183 
184 	alpha_bridge = agp_alloc_bridge();
185 	if (!alpha_bridge)
186 		goto fail;
187 
188 	alpha_bridge->driver = &alpha_core_agp_driver;
189 	alpha_bridge->vm_ops = &alpha_core_agp_vm_ops;
190 	alpha_bridge->current_size = aper_size; /* only 1 size */
191 	alpha_bridge->dev_private_data = agp;
192 	alpha_bridge->dev = pdev;
193 	alpha_bridge->mode = agp->capability.lw;
194 
195 	printk(KERN_INFO PFX "Detected AGP on hose %d\n", agp->hose->index);
196 	return agp_add_bridge(alpha_bridge);
197 
198  fail:
199 	kfree(pdev);
200 	return -ENOMEM;
201 }
202 
203 static int __init agp_alpha_core_init(void)
204 {
205 	if (agp_off)
206 		return -EINVAL;
207 	if (alpha_mv.agp_info)
208 		return alpha_core_agp_setup();
209 	return -ENODEV;
210 }
211 
212 static void __exit agp_alpha_core_cleanup(void)
213 {
214 	agp_remove_bridge(alpha_bridge);
215 	agp_put_bridge(alpha_bridge);
216 }
217 
218 module_init(agp_alpha_core_init);
219 module_exit(agp_alpha_core_cleanup);
220 
221 MODULE_AUTHOR("Jeff Wiedemeier <Jeff.Wiedemeier@hp.com>");
222 MODULE_LICENSE("GPL and additional rights");
223